A rock falls off a bridge and hits the water 8 seconds later. How high is the bridge? A rock falls off a bridge and hits the water 8 seconds later. How high is the bridge?
176.4 meters
The hammer will take square-root(2x80/9.8)= 4.04 seconds to hit the ground.
The distance is related to the time by s=v0t + 1/2 gt^2 where vo, the initial velocity is=0.
The answer is 4.04 or rounded is 4 seconds.
Mass
20.40
176.4 meters